There are three output types we can offer for our Tiltmeters:
- +/- 5 Volts
Voltage and 4-20mA are both considered to be an Analogue signal which may be preferable to those that want to use their own Datalogger or simple readout device. Voltage is limited by not being able to achieve long cable lengths however 4-20mA can pick up the benefits in this respect. So if an Analogue signal is preferable and you need a long cable length (>70m), 4-20mA would be the better choice.
Should there be a situation where you require a number of Tiltmeters in a string to achieve a profile, then RS485 would be the preferable choice. The benefit of RS485 signal is that the Tiltmeters can be daisy chained, minimising the amount of cables running to a datalogger such as the GeoLogger G8 Plus. They can also be read using a Windows tablet with our G-Tilt or Tilt Checker software. Each Tiltmeter is identified and communicated to using the unique serial number assigned to it and sends 1 or 2 Tilt values depending on whether it is Uniaxial or Biaxial (usually Sine of the angle) and Temperature reading.
Multiple monitoring points in close proximity to each other
Digital Bus Tiltmeters would be the way forward here to allow you to connect each Tiltmeter in series and have only one cable sending the data from all Tiltmeters in that array. Saves a considerable amount of cable needed for the job.
Tiltmeter or Tilt Beam?
It depends on whether you can comfortably assume that the structure you are measuring will move as a uniform entity. If this can be assumed then a Tiltmeter will suffice. However, as in most cases, this cannot be assumed and this is where a Tilt Beam would be superior in providing you with a better understanding of how that structure is moving. For example, if you are measuring the Tilt on a church steeple with a 3m Tilt Beam, you cannot assume that the displacement from the vertical plane you are measuring can be applied to the entire height of the structure. Therefore it would be preferable to place numerous Tiltbeams to span the full height of the structure. This way it can provide a useful Profile of what is happening to the building as a whole.
Orientation of Tiltmeter:
Geosense Tiltmeters have
a measuring ranges of +/- 5,10 & 15°. Generally, a Tiltmeter is either mounted Horizontally or Vertically. A suitable mounting bracket would then be supplied depending on this detail. Each sensor is supplied with a label showing the measurement range it has been calibrated for.
Geosense Tiltmeters are manufactured to meet the Electromagnetic Compatibility Directive 2014/30/EU . To comply with this directive, special braided cable needs to be used which ensures the EMC protection throughout the cable route. If the cable is to be spliced, a special splice kit is to be supplied to ensure the EMC compliance is continued. Should the cable terminate in a data logger, Geosense supply EMC compliant cable glands which crimp on to the braid of the cable. All RS485 digital output Tilt meters and uniaxial Analogue Tiltmeters require a 2pair braided cable. Biaxial Analogue Tiltmeters require 3 pair braided cable to be able to send the signal from the extra measuring axis.